JP2004364346A - Packing for door of switchboard or the like - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packing for a door of a switchboard or the like where a tubular part is easy to be crushed when pressed by the edge of a case or the door at closing of the door, for closing operation of the door that requires less force. <P>SOLUTION: In the packing for the door of the switchboard or the like, an attaching part is fitted to either the edge part that surrounds the entire periphery of an opening of the case of a switchboard or the like or the edge part of the door facing that edge part. The tubular part of elastic material is swollen from the attaching part toward the other edge part. A projection and a recess extending in the longitudinal direction of the tubular part are repeatedly formed on the inner peripheral surface of the tubular part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packing for sealing a space between a door and a housing over an entire periphery of an opening of the housing when the door is closed in a switchboard or the like.
[0002]
2. Description of the Related Art In order to prevent a short circuit caused by infiltration of rainwater or adhesion of dust, in a housing containing a switchboard, a packing is pressed when a door is closed to obtain a sealed state.
In conventional composite structure packing, the mounting part to be attached to the edge of the door is formed of solid rubber, and the tongue piece that projects a certain length from the mounting part and presses against the edge of the housing is molded with sponge rubber. (See Patent Document 1).
[0003]
As an improvement of the packing in which the tongue piece is formed so as to protrude from the mounting portion, a cylindrical portion is formed to protrude from the mounting portion and the cylindrical portion is pressed against the edge of the other party (for example, Patent Document 2 (See, for example, Patent Document 3). Alternatively, there is a tubular part that is connected to a mounting part and a tongue piece is formed to project from the tubular part.
[0004]
The packing having the cylindrical portion has a stronger sealing performance than the packing formed by projecting the tongue piece directly from the mounting portion.However, when the packing is arranged all around the opening of the housing, it is less than the sponge rubber. The elastic reaction force of the cylindrical part becomes extremely large, and when the lock cam of the lock handle device equipped on the door is engaged with the receiving part on the housing side and the door is tightened to the housing, the operation handle reaches the tightened position. Requires a lot of power to turn.
[0005]
[Patent Document 1] Japanese Utility Model Application Laid-Open No. Sho 62-185405 [Patent Document 1] Japanese Patent No. 2999973 [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-283624
SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a packing for doors of a switchboard or the like in which the entire periphery of the opening can be easily sealed with a relatively small operating force.
[0007]
A door packing according to the present invention has a mounting portion mounted on one of an edge surrounding the entire opening of a housing such as a switchboard and an edge of the door facing the edge. The cylindrical portion is formed by swelling with an elastic material toward the other edge from the mounting portion, and a protruding ridge and a groove extending in the longitudinal direction of the cylindrical portion on the inner peripheral surface of the cylindrical portion. The portion is formed repeatedly in the circumferential direction.
[0008]
In the switchboard, one end of the door 4 is connected to the housing 1 by a hinge shaft (not shown), and the other end of the door 4 is provided with a lock handle device (not shown). The mounting portion 7 of the packing 6 is attached to, for example, the edge 3 of the housing 1.
[0009]
When the door 4 is rotated in the closing direction about the hinge axis, the edge 5 of the door 4 comes into contact with the outer surface of the cylindrical portion 8 of the packing 6 in the end region of the closing rotation. After this abutment, the operating handle of the lock handle device is turned to engage the lock cam with the receiving portion on the housing side, and tighten the door 4 and the housing 1. Of the housing 1 and the door 4 are sealed.
[0010]
The crushing deformation of the cylindrical portion 8 of the packing 6 is, as a whole, the closing deformation of the groove 10 between the ridges 9 and 9 at the initial stage and the next deformation after the groove 10 has disappeared by closing. At the stage of volumetric compression deformation of the entire cylindrical portion.
[0011]
Depending on the arrangement of the packing 6 and the positional relationship with the hinge shaft, the closing deformation of the groove portion 10 and the volume compression deformation of the tubular portion 8 may be locally performed simultaneously.
[0012]
Thus, globally, the cylindrical portion 8 of the packing 6 is crushed and deformed in two stages, so that even when the opening 2 of the housing 1 is sealed all around, the packing 6 is substantially covered over its entire length. Evenly crushed, the elastic reaction force at the time of its compressive deformation becomes small.
[0013]
DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, a mounting portion 7 made of solid rubber is formed in a U-shaped cross section, and a metal core 12 made of a spring steel material is disposed at the center. The tubular portion 8 made of sponge rubber is formed in a tubular shape having a substantially semicircular cross section, and the tongue piece 11 is protruded in two places in the centrifugal direction.
[0014]
The mounting portion 7 and the cylindrical portion 8 of the packing 6 are continuously formed as a single body by a so-called two-color molding method.
[0015]
The protrusion 9 and the groove 10 have an arc-shaped cross section, and are formed in a continuous wave shape. A pressing portion 13 for increasing frictional resistance is formed on the inner surface of the mounting portion 7 so as to project obliquely from the base material.
[0016]
The packing 6 is fitted to the edge 3 of the housing 1 so as to crush the pressing portion 13, and is elastically engaged with the edge 3 by the elastic reaction force of the solid rubber itself and the elastic reaction force of the cored bar 12. ing.
[0017]
The cross-sectional shape of the cylindrical portion 8 of the packing 6 can take various forms such as a circular shape, a semi-circular shape, an elliptical shape, a trapezoidal shape, a partially circular shape, or a partially elliptical shape. Is not particularly limited. Part of the tubular part may also serve as part of the mounting part.
[0018]
The cross-sectional shapes of the protrusion 9 and the groove 10 are not limited to those shown in the drawings, and any shape may be used as long as the closing of the groove 10 is induced prior to the volume compression deformation of the tubular body. .
[0019]
As described above, in the door packing of the present invention, the tubular portion is formed of a resilient material from the mounting portion attached to one of the edge of the housing and the edge of the door toward the other edge. Because the ridge and groove extending in the length direction of the cylindrical portion are formed repeatedly on the inner peripheral surface of the cylindrical portion in the circumferential direction, the edge of the housing is closed when the door is closed. Alternatively, when the outer surface of the tubular portion is pressed by the edge of the door, the tubular portion is easily crushed and deformed by being guided by the ridges and grooves.
[0020]
As described above, since the elastic reaction force at the time of compressive deformation of the cylindrical portion as a whole is reduced, even when the packing is arranged all around the opening of the housing, the lock handle device of the door is relatively small in force. Can be tightened and rotated.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a packing according to an embodiment of the present invention.
FIG. 2 is a perspective view of a main part when the packing of FIG. 1 is mounted on an edge of a housing.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Housing 2 Housing opening 3 Housing edge 4 Door 5 Door edge 6 Packing 7 Packing attachment part 8 Packing tubular part 9 Projecting ridge on the inside of a tubular part 10 Groove on the inside of a tubular part Strip 11 Tongue piece 12 of packing Core 13 Pressing part

Claims (1)

An attachment portion is attached to one of an edge portion surrounding the entire periphery of the opening of the housing such as a switchboard and an edge portion of the door facing the edge portion, and a cylindrical portion is formed from the attachment portion toward the other edge portion. A door packing for a switchboard or the like, which is formed by swelling with an elastic material and has a ridge and a groove formed in the inner peripheral surface of the cylindrical portion and extending in the length direction of the cylindrical portion repeatedly in the circumferential direction.

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